Telephone switchboard



Oct. 10, 1933; KNQWLTQN r A 1,930,275

TELEPHONE SWITCHBOARD Filed May 20, 1952 FIG.

A. D. KNOWLTON ACZGILMORE A T TORNE V lNl/ENTORS' panel orthe'switchboard;

Patented Oct." 10, I 1933 This invention relatesjto switchboards landmore particularly to .telephone switchboards wherein telephone linesare; terminated.

An object of the invention is to make the equipment for groups oftelephone lines terminating at switchboard interchangeable], t

Another objectis, to adjust the'switchboard positionof any line orlinesas required.

A feature lof jthe pi s ent. invention whereby above mentiOnedobjectsare attained resides in "a'combination of unnumbered jack'terminals,separate designationstrips, ,a uniform length of switchboard cabling andterminal strips arranged in order to correspond to the positions of saidjack terminals as hereinafter set 'forth'. i 1

The invention will be understood from the following description and thefigures of the, accompanying drawing in which 'the f eatures of theinventio'n are illustrated: w i r Fig 1 of the drawing shows a centraloiiice switchboard, its 1accik'mipanying distributing frame, and thearrangement of the switchboard cables connecting the switchboard to thedistributing frarnej W i w I n Fig. ,2,shows the e uiprnent for twogroups of common battery lines appearing in the same Fig. 3' shows thearrangement of the cabling for groups of single appearance linesterminating in four adjacent panels of the switchboard; and

Fig.4 shows the arrangement of the cabling for groups of doubleappearance lines multiplied on a four panel basis. 7 V

' Referring to the drawing, the switchboard shown in Fig. 1 consists oftwo sections or operators positions 1 and 2. In each sectionjare twopanels 3 and 4'and 5 and 6,'respectivelyj wherein subscribers magnetoand common battery telephone lines-have appearances; At oneend. oftheswitchboard is the distributing frame '7 to which are attached aplurality of terminal strips or blocks as, for example, the strips 11,12, 13 andy14.

Telephone line conductors (not shown) entering thecentral ofiice areconnected to the upper terminals on the terminal strips, as for example,the terminals 8v in Fig. 2, Commonbattery lines are terminated on theuppersix rows of strips and magneto lines on the lower row in thepresent instance. Upon each strip aplurality; of lines may beterminated, a group of 20 lines or 40 conductors, ordinarily beingconnected to: each terminal strip." i y u g y Y i To theterminals on theunder sides of said strips, ior example, the terminals 9 of Fig. 2,

each of which is conductively Iconnected to the upperterminalimmediately above it, are'com nectedthe conductors oftheswitchboard cables,

for example the conductors 10 of the cable, 23.

The cable conductors terminate at the otherend in the switchboard faceequipment, the conductors of cable 23, for example, are connected to thetip and ring connections of the jacks 20 which are mounted in "jackstrip 16. Associated'with the jack strip 16 is a lamp I strip 17containing lamp sockets holding the lamps 18. A lamp'is located directlybelow each jack, the circuit wiring connecting them. i In magneto linesdrops are as,- sociated with the line jacks in place of. lamps. Directlyaboveeach jack strip is a designation strip holder 19 in which acardboard designation strip may be inserted bearing the line numbers.

q The terminal strips are located in the same relativeposition on thedistributing frame as the associated equipment is located in the switchboard,,terminal strip 1 3,,for example,being locatpedon the distributingframe in the thirdcolumn and top row of terminal strips, while itsassociated switchboard equipment 33, is locatedat the top of the; thirdpanel in theswitchboar'd.

The cables connecting the terminal strips with the switchboard equipmentare ofequal length for allgroups of lines :appearingfin the sameswitchboard panel, ;-For example, cable 23 con.-

. necting terminal strip l3 withthe switchboard equipment 3 3 located inpanel 5 is equalin length to cable 25. cdnnecting the terminal strip,15with the switchboard equipment 35 also located in panel 5, asindicatedin Fig. l and more clearly terylinesterminating in the samepanel and they are, therefore, interchangeable. ,The designation stripholders are not permanently connectedjto their associated jackstrips andtherefore may be distributed in'front ofthe'operatorsin themosteflicient operating arrangement suitableto any so ,I

particular'size of switchboard without changing thesubscribers numbers.n q t n ,Fig. 3 shows the relation otthecabling between r str p 1 l;12.1l ndhl and switchboar appearances 31', 32, 33 and 34 appearing atthe tops of the panels 3, 4, 5 and 6, respectively. It will be notedthat the cables 21, 22, 23 and 24 are of progressively greater length.

From the above description, it will be seen that only four types of lineterminal equipment units are needed, one type only being required foreach panel.

Fig. 4 shows the cabling arrangement for an eight panel switchboardwherein the lines are multiplied on a four panel basis. The linesappearing at 40, for example, also appear at 41, four panels to theright. In this case also only four types of line equipment are required,each type providing for two appearances. In this case, line lamps willordinarily be inserted at only one of the two line appearances althoughsockets are v provided at each appearance. These lamps may, therefore,be changed to suit trafiic conditions.

While the accompanying specification and drawing set forth the inventionin certain specifled embodiments, we do not wish to be limited to thesealone, but intend to cover the invention broadly within the spirit andscope of the appended claims.

What is claimed is:

1. Ina telephone exchange, a switchboard, a plurality of panels thereon,a distributing frame, cables of Y telephone line conductors between saidframe'and said panels, all of said cables terminating in any panel beingof equal length.

2. In combination, a telephone switchboard comprising panels containingtelephone line jacks mounted in strips, a separate designation stripassociated with each of said jack strips, a distributing frame at oneend of said switchboard, terminal strips on said frame, and cablesconnecting the terminal strips on said frame with said jack strips allof the cables terminating in any panel being of equal length. I

'3. In a telephone exchange, a switchboard, a plurality of panelsthereon, strips of telephone jacks on each panel, a distributing frame,terminal strips on said frame, a cable of telephone conductorsconnecting each said jack strip with one of said terminal strips, all ofsaid cables terminating in any panel being of equal length. 4. In atelephone exchange, a switchboard, a panel thereon, a distributingframe, means for terminating a first group of telephone lines on saidpanel comprising a terminal strip on said distributing frame, a jackstrip on said panel, and a cable connecting said -pair of strips, likemeans for terminating a second group of telephone lines on said panel,said first and second means being interchangeable.

5.In' a telephone exchange, a switchboard, a panel thereon, adistributing frame, means for terminating a first group oftelephonelines on said panel comprising a terminal strip on said distributingframe, a jack strip on said panel, and a cable connecting said pair ofstrips, and identically proportioned means for terminating a secondgroup of telephone lines on said panel.

6. In a telephone exchange, a multiple switchboard,'strips of telephoneline jacks thereon, a distributing frame, terminal strips on said frame,a single cable connecting each terminal strip with the jack strips atthe multiple line appearances, said combinations of terminal strips,cables, and jack strips being interchangeable.

7. In a telephone exchange, a switchboard, multiple panels thereon, adistributing frame, means for terminating a first group of telephonelineson ,said multiple panels comprising a terminal strip on saiddistributing frame, a jack strip on each of said multiple panels, and acable connecting said terminal strip with said plurality of jack strips,like means for terminating a second group of telephone lines on saidmultiple panels, said first and second means being interchangeable.

8. Iii-combination, a" switchboard panel containing strips of unnumberedjacks, a designation strip associated with each of said jack strips, adistributing frame, terminal strips arranged in vertical order on saidframe, and cables of equal lengths connecting said jack strips with saidterminal strips, each jack strip being connected with the-terminal striphaving the same relative vertical position.

9. In combination, a switchboard panel containing, jack strips, adistributing frame, terminal strips arranged in vertical order on saidframe, andcablea of equal length connecting said jack strips with saidterminal strips, each jack strip being connected with a terminal striphaving the same relative vertical position.

10. In a telephone exchange, a switchboard, a-plurality of panelsthereon, jack strips mounted in said panels, a distributing frame at oneend of said switchboard, terminal strips on said frame, a length ofswitchboard cable connecting each said jack strip with one of saidterminal strips, said combinations comprising jack strip, cable andterminal, strip associated with any panel being interchangeable.

11. In a telephone exchange, a switchboard, a plurality of panelsthereon, jack strips mounted in said panels, a distributing frame,terminal strips on said frame, a length of switchboard cable connectingeach said jack strip with one of said terminal strips, said combinationscomprising jack strip, cable and terminal strip associated with anypanel being interchangeable.

12. In a telephone exchange, a switchboard, a plurality of panelsthereon, jack strips mounted in said panels, a distributing frame,terminal strips on said frame, a length of switchboard cable connectingeach of said jack strips with one of said terminal strips, a pluralityof said combinations of jack strip, cable and terminal strip terminatingin any, panel being identical in dimensions.

13. In a telephone exchange, a multiple switchboard, a plurality ofpanels thereon, jack strips mounted on said panels, a distributing frameat one end of saidswitchboard, terminal strips on said frame, a singlecable connecting each said terminal strips with jack strips at themultiple line appearances, said combinations of, terminal strip, cableand jack strips being interchangeable;

14. In a telephone exchange, a switchboard, a panel thereon, jac kstrips in said panel, a distributing frame at one end of saidswitchboard, terminalstrips thereon, a length of cable connecting eachsaid jack strip with a terminal strip individual thereto, saidassemblages of jack strips,

cable and terminal strips being interchangeable.

